Use Mix and sass, simplify image directories and remove duplicates

assets/sass/components/post.sass

@@ -0,0 +1,26 @@
+pre code,
+pre code.hljs,
+.hljs
+    @apply .p-4
+    @apply .text-sm
+    @apply .border-l-4
+    @apply .border-grey-dark
+    @apply .block
+    @apply .bg-grey-lighter
+    @apply .overflow-x-scroll
+    @apply .font-mono
+
+p,
+li
+    code
+        @apply .bg-grey-lighter .inline-block .font-mono
+        padding: 1px 3px
+
+.note
+    @apply .bg-blue-lighter
+    @apply .p-4
+    @apply .border-l-4
+    @apply .border-blue
+
+.note > *:last-child
+    @apply .mb-0